package command;

/**
 * @author : DuJiabao
 * @Date : 2021/3/16 15:51
 * @Project : design-pattern
 * @File : null.java
 * @Desc :
 */
public class Light {
  public void on() {
    System.out.println("开灯");
  }

  public void off() {
    System.out.println("关灯");
  }
}
